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수여부와 블록 이식골의 동시 피질골 천공과 수여부 피질골 천공의 비교
장인걸(In-Geol Chang),이동걸(Dong-Geol Lee),신창훈(Chang-Hoon Shin),홍종락(Jongrak Hong) 대한구강악안면외과학회 2009 대한구강악안면외과학회지 Vol.35 No.6
Purpose: The aim of this study is to compare volume and revascularization of autogenous block bone grafts in simultaneously cortical perforation of recipient beds and grafts, and only cortical perforation of recipient beds. Materials and methods: Two block bone in 8mm diameter was harvested in both skull using trephine bur on 20 New Zealand white rabbits. Harvested block bone was grafted on both inferior border of mandible. On the left side(experimental side), cortical bone of recipient beds and graft were perforated, and on the right side(control side), the only recipient bed was perforated. The rabbits had been sacrificed and infused the India ink for the observation of revascularization at 20 day and 40 day after surgery. The specimens were processed for H-E staining and quantitative analysis(independent t-test, p<0.01) was made under an optical microscope. In additional, specimens were processed for the observation of revascularization. Results: After 20 days, more bone volume was observed in experimental group, but no significant difference between two groups(p=0.106). There were significantly more bone volume in the experimental group at 40 days after surgery(p<0.01). After 20 days, more discrete vascular sprouts were observed in experimental side, but no difference at 40 days after surgery. Conclusion: We conclude that the cortical perforation of both the recipient beds and grafts improve revascularization at early stage and overall graft persistence.
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건축공사 책임감리제도 개선에 관한 연구 : P.Q제도를 중심으로 Focused on the Prequalification System
장철인,정회걸 서강정보대학 1999 論文集 Vol.18 No.-
To consider the efficiency of system operation under the introduction of the PQ, this study investigated the condition of the current national liability supervising system, and the condition of the operation of the foreign supervising system. This study also investigated the current PQ criterion, judgement method, and the problem of the PQ intention decision process. This study was conducted to try to find a engineering competition improvement of national supervising system and PQ system development direction through the presentation of reasonable improvement plan. In conclusion, this study was tried to find a improvement guide through analysis of problem in current system, but we was not concluded that all problem was improved by replacement of system or rule. It was more important that order and service system were respect to PQ Judgement criterion and engaged on construction engineering service system. It was important that presentation of reasonable system. but these system was applicated justly and elastically under the condition of faithful contract performance. We expected that in these condition. improved system was used efficiently and positive effect through the system improvement.
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